Correlations of the logarithms of acceleration, velocity and displacement peak amplitudes of recorded strong earthquake ground motion with the Modified Mercalli Intensity scale, IMM, are characterized by large scatter of data points. For a given IMM this scatter is equal to about one order of magnitude on the linear amplitude scale. Correlations have been presented that are valid for the range of intensities IV ≤ IMM ≤ VIII, which correspond to 187 strong-motion accelerograms recorded during 57 earthquakes in the Western United States. Extrapolation of these correlations on the logarithmic scale to the largest Modified Mercalli intensity level IMM = XII lead to strong-motion amplitudes which are not contradicted by other independent estimates of these largest amplitudes.

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